Oracle

At the beginning of your upkeep, draw a card if you control a creature with the greatest power among creatures on the battlefield. Otherwise, put a +1/+1 counter on a creature you control.

Rulings

You determine whether you draw a card or put a +1/+1 counter only as Primal Empathy’s triggered ability begins resolving. Players may respond to the ability to try to change which happens. [0000-00-00]

If the greatest power among creatures on the battlefield is shared by a creature you control and a creature you don’t control, you draw a card. [0000-00-00]

If you don’t control a creature with the greatest power, you choose which creature gets a +1/+1 counter while the ability is resolving. Players can’t take actions in between the time you make this choice and the time that creature has a +1/+1 counter. [0000-00-00]

If you control no creatures, you do nothing as Primal Empathy’s ability resolves. If there are no creatures on the battlefield at all, you don’t draw a card. [0000-00-00]